Its mostly the newer Warwicks, apparently all the new ones have them. Can't say I've ever noticed either. I doubt there was ever an Alembic in the same state as me.

Ajustable Nut? Hmm, get yourself a few nut blanks and an appropriate file set, should give you all the adjustment you need. Probly almost end up cheaper than buying one of the just-a-nuts off Warwick, almost definitely cheaper than buying the Alembic equivalent. You could then use your knowledge to do nut work for people you know, and it'll probly pay itself off. Note: I, personally, would do this for the price of materials for friends, and at a small profit for anyone else (Sorry, just couldn't resist ).

If you're set on the adjustable nut, you might find if your music store stocks Warwicks they might be able to order in the nuts (parts break, and if outside warranty you want to able to fix it, and so do they).